Double-end-face mechanical sealing structure

Abstract

The utility model discloses a double-end-face mechanical sealing structure which comprises a front end seat, the front end seat wraps one side of a pump rotating shaft, a front end static ring is installed on the right side of the front end seat, a front end moving ring is movably installed on the surface of the inner wall of the front end static ring, the front end moving ring wraps the outer side of the pump rotating shaft, and a rear end static ring is installed on the right side of the front end static ring. According to the double-end-face mechanical sealing structure, the left sides of the upper hoop and the lower hoop and the outer side of the front-end static ring are sealed through isolating bars; meanwhile, the right sides of the upper hoop and the lower hoop and the outer side of the shaft sleeve are sealed through an isolating bar; medium can be prevented from entering a spring cavity used for installing the spring, the medium can be effectively prevented from entering the spring cavity, the leakage possibility is reduced, and the sealing reliability is improved. The spring is prevented from being in direct contact with sealing media, corrosion and damage of the media to the spring are reduced, and the service life of the spring is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of mechanical seals, and specifically to a double-ended mechanical seal structure. Background Art

[0002] Double-ended mechanical seals are mostly used in occasions with poor lubricity, flammable, explosive, toxic, particulate-containing media, and vacuum. Although the structure is relatively complex, due to the better effect of double-ended mechanical seals, double-ended mechanical seals must be used for certain special working conditions.

[0003] A double-ended mechanical seal is a common sealing device, usually used in equipment such as rotor pumps to prevent medium leakage. The following are the general installation steps:

[0004] Manufacture the sealing surface: According to the double-ended dimensions of the pump, select appropriate sealing surface materials and cut or process them according to the dimension requirements. Fine-grind the sealing surface to ensure surface smoothness and flatness.

[0005] Manufacture the sealing ring: According to the double-ended dimensions of the pump, select appropriate sealing ring materials and cut or mold them according to the dimension requirements. The manufactured sealing ring should ensure a tight fit with the sealing surface and be able to withstand a certain amount of pressure and temperature.

[0006] Install the sealing surface and the sealing ring: Install the manufactured sealing surface on the double ends of the pump, ensuring perpendicularity to the axis. Apply a certain amount of lubricating oil on the sealing surface to reduce friction and wear of the pump. Install the manufactured sealing ring on the outside of the sealing surface, ensuring a tight fit with the sealing surface. Adjust the pressure and clearance between the sealing ring and the double ends of the pump to ensure the sealing effect.

[0007] Install the spring and the fixing parts: Install a spring on the inner side of the double ends of the pump so that it can provide a certain amount of pressure to keep the sealing ring in contact with the sealing surface. Use the fixing parts to fix the spring on the double ends of the pump to ensure the stable position of the spring.

[0008] The static and dynamic rings of the double-ended mechanical seal device of the rotor pump are press-fitted by a spring. The tiny medium in the pump body is easy to come into contact with the spring, which is easy to cause corrosion to the spring and reduce the service life of the spring. Summary of the Utility Model

[0009] The purpose of the utility model is to provide a double-ended mechanical seal structure to solve the defects mentioned in the above background art.

[0010] To achieve the above object, a double-end mechanical seal structure is provided, which includes a front seat. The front seat is wrapped around one side of the pump rotating shaft, and a front stationary ring is installed on the right side of the front seat. At the same time, a front rotating ring is movably installed on the inner wall surface of the front stationary ring, and the front rotating ring is wrapped around the outside of the pump rotating shaft. A rear stationary ring is installed on the right side of the front stationary ring, and a rear rotating ring is installed on the inner wall of the rear stationary ring. At the same time, a gland is arranged outside the rear stationary ring, and a shaft sleeve is fixedly installed at the front of the gland. A spring is arranged between the gland and the rear rotating ring. A medium accommodating cavity is formed between the front stationary ring, the rear stationary ring and the rear rotating ring. A sealing disc member is wrapped between the front stationary ring and the shaft sleeve, and the sealing disc member includes an upper hoop. At the same time, a lower hoop is installed at the bottom of the upper hoop, and the lower hoop and the upper hoop are fixedly connected by screwing with four groups of fixing bolts.

[0011] Preferably, a first sealing ring is arranged between the front rotating ring and the front stationary ring, and the first sealing ring is wrapped around the outside of the pump rotating shaft. At the same time, the cross-section of the first sealing ring is a triangular structure.

[0012] Preferably, a second sealing ring is arranged between the front stationary ring and the rear stationary ring, and the rectangle of the second sealing ring is a square.

[0013] Preferably, both the upper hoop and the lower hoop are semicircular structures made of metal materials, and the upper hoop and the lower hoop together form an isolation sealing structure for the spring.

[0014] Preferably, assembly plates are welded and fixed on both sides of the bottom of the upper hoop and the lower hoop, and two installation holes are opened on the assembly plates. At the same time, the two assembly plates are fixedly connected by screwing with two groups of fixing bolts.

[0015] Preferably, slots are opened on the outer sides of the upper hoop and the lower hoop, and the cross-section of the slots is a dovetail structure. At the same time, isolation strips are installed on both sides of the inner walls of the upper hoop and the lower hoop. The isolation strips are made of rubber materials and have a dovetail-shaped cross-section. The upper hoop and the lower hoop are respectively clamped inside the sealing tracks opened on the outer sides of the front stationary ring and the shaft sleeve through the isolation strips on both sides of their inner parts, and the isolation strips are in interference fit with the sealing tracks.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] Sealing is carried out between the left sides of the upper hoop and the lower hoop and the outer side of the front stationary ring through the isolation strips; at the same time, sealing is carried out between the right sides of the upper hoop and the lower hoop and the outer side of the shaft sleeve through the isolation strips; it can prevent the medium from entering the spring cavity for installing the spring, effectively prevent the medium from entering the spring cavity, reduce the possibility of leakage, and improve the reliability of the seal; avoid the spring from directly contacting the sealing medium, reduce the corrosion and damage of the medium to the spring, and extend the service life of the spring;

[0018] When the upper hoop and the lower hoop are installed by screwing with fixing bolts, an isolation strip made of rubber can be tightly clamped inside the sealing track, which can carry out a tight and sufficient isolation medium work on the spring; prevent impurities or sediments in the medium from entering the spring cavity, affecting the elasticity and working performance of the spring, and ensure that the spring can stably provide a sealing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view schematic diagram of the structure of the present utility model;

[0020] Figure 2 It is the structure of the present utility model Figure 1 side view;

[0021] Figure 3 It is the structure of the present utility model Figure 1 sectional structure schematic diagram;

[0022] Figure 4 It is a schematic diagram of the upper hoop structure of the present utility model;

[0023] Figure 5 It is a top view of the upper hoop structure of the present utility model.

[0024] Reference numerals in the figure: 1, front end seat; 2, front end moving ring; 3, front end static ring; 4, rear end static ring; 5, rear end moving ring; 6, medium accommodating cavity; 7, first sealing ring; 8, second sealing ring; 9, shaft sleeve; 10, spring; 11, gland; 12, sealing disc member; 121, upper hoop; 122, lower hoop; 123, assembly plate; 124, fixing bolt; 125, slot; 126, isolation strip. SPECIFIC EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0026] Please refer to Figures 1-5, the present utility model provides a double - end mechanical seal structure, including a front seat 1, the front seat 1 is wrapped on one side of the pump rotating shaft, and a front stationary ring 3 is installed on the right side of the front seat 1. At the same time, a front dynamic ring 2 is movably installed on the inner wall surface of the front stationary ring 3, and the front dynamic ring 2 is wrapped outside the pump rotating shaft. A rear stationary ring 4 is installed on the right side of the front stationary ring 3, and a rear dynamic ring 5 is installed on the inner wall of the rear stationary ring 4. At the same time, a gland 11 is arranged outside the rear stationary ring 4, and a shaft sleeve 9 is fixedly installed at the front part of the gland 11. A spring 10 is arranged between the gland 11 and the rear dynamic ring 5. A medium accommodation cavity 6 is formed between the front stationary ring 3, the rear stationary ring 4, and the rear dynamic ring 5. A sealing disc part 12 is wrapped between the front stationary ring 3 and the shaft sleeve 9, and the sealing disc part 12 includes an upper hoop 121. At the same time, a lower hoop 122 is installed at the bottom of the upper hoop 121, and the lower hoop 122 and the upper hoop 121 are fixedly connected by screwing with four groups of fixing bolts 124.

[0027] Working principle: The upper hoop 121 and the lower hoop 122 are combined to form an isolation and sealing structure for the spring 10. When the upper hoop 121 and the lower hoop 122 are installed, they are fixedly connected by screwing with two groups of assembly plates 123. At the same time, the left side between the upper hoop 121 and the lower hoop 122 and the outside of the front stationary ring 3 is sealed by an isolation strip 126; at the same time, the right side between the upper hoop 121 and the lower hoop 122 and the outside of the shaft sleeve 9 is sealed by an isolation strip 126; it can prevent the medium from entering the spring cavity for installing the spring 10, effectively prevent the medium from entering the spring cavity, reduce the possibility of leakage, and improve the reliability of the seal; avoid the spring 10 directly contacting the sealing medium, reduce the corrosion and damage of the medium to the spring, and extend the service life of the spring.

[0028] As a preferred embodiment, a first sealing ring 7 is arranged between the front dynamic ring 2 and the front stationary ring 3, and the first sealing ring 7 is wrapped outside the pump rotating shaft. At the same time, the cross - section of the first sealing ring 7 is a triangular structure.

[0029] A second sealing ring 8 is arranged between the front stationary ring 3 and the rear stationary ring 4, and the rectangle of the second sealing ring 8 is a square.

[0030] Both the upper hoop 121 and the lower hoop 122 are made of metal and are semi - circular structures, and the upper hoop 121 and the lower hoop 122 are combined to form an isolation and sealing structure for the spring 10.

[0031] As a preferred embodiment, assembly plates 123 are welded and fixed on both sides of the bottom of the upper hoop 121 and the lower hoop 122, and two installation holes are opened on the assembly plates 123. At the same time, the two groups of assembly plates 123 are fixedly connected by screwing with two groups of fixing bolts 124.

[0032] Grooves 125 are provided on the outer sides of the upper hoop 121 and the lower hoop 122, and the cross-section of the groove 125 is a dovetail structure. At the same time, isolation strips 126 are installed on both sides of the inner walls of the upper hoop 121 and the lower hoop 122. The isolation strip 126 is made of rubber and has a dovetail-shaped cross-section. The upper hoop 121 and the lower hoop 122 are respectively clamped inside the sealing tracks provided on the outer sides of the front static ring 3 and the shaft sleeve 9 through the isolation strips 126 on both sides inside them, and the upper hoop 121, the lower hoop 122 and the sealing tracks are in interference fit.

[0033] The isolation strip 126 is in interference fit with the sealing track; the isolation strip 126 is clamped inside the sealing track. When the upper hoop 121 and the lower hoop 122 are bolted and installed through the fixing bolts 124, the rubber isolation strip 126 can be tightly clamped inside the sealing track, and can perform the work of tightly isolating the medium for the spring 10; preventing impurities or sediments in the medium from entering the spring chamber, affecting the elasticity and working performance of the spring, and ensuring that the spring can stably provide the sealing force.

[0034] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-end mechanical seal structure, comprising a front end seat (1), characterized in that: The front end seat (1) is wrapped around one side of the pump shaft, and a front end stationary ring (3) is installed on the right side of the front end seat (1), and a front end moving ring (2) is movably installed on the inner wall surface of the front end stationary ring (3), and the front end moving ring (2) is wrapped around the outer side of the pump shaft, a rear end stationary ring (4) is installed on the right side of the front end stationary ring (3), and a rear end moving ring (5) is installed on the inner wall of the rear end stationary ring (4), and a pressure cover (11) is arranged on the outer side of the rear end stationary ring (4), and a shaft sleeve (9) is fixedly installed on the front of the pressure cover (11), and the pressure cover ( A spring (10) is arranged between the front static ring (3), the rear static ring (4) and the rear dynamic ring (5), a medium accommodating chamber (6) is formed between the front static ring (3), the rear static ring (4) and the rear dynamic ring (5), a sealing disk (12) is wrapped between the front static ring (3) and the shaft sleeve (9), and the sealing disk (12) includes an upper clamp (121), and a lower clamp (122) is installed at the bottom of the upper clamp (121), and the lower clamp (122) and the upper clamp (121) are screwed and fixed by four sets of fixing bolts (124).

2. A double-end mechanical seal structure according to claim 1, characterized in that: A first sealing ring (7) is arranged between the front end dynamic ring (2) and the front end static ring (3), and the first sealing ring (7) is wrapped around the outside of the pump shaft, and the cross section of the first sealing ring (7) is a triangular structure.

3. A double-end mechanical seal structure according to claim 1, characterized in that: A second sealing ring (8) is arranged between the front static ring (3) and the rear static ring (4), and the rectangle of the second sealing ring (8) is arranged to be a square.

4. A double-end mechanical seal structure according to claim 1, characterized in that: The upper clamp (121) and the lower clamp (122) are both semicircular structures made of metal material, and the upper clamp (121) and the lower clamp (122) are combined together to form an isolation sealing structure of the spring (10).

5. A double-end mechanical seal structure according to claim 1, characterized in that: The upper clamp (121) and the lower clamp (122) are both welded to the bottom sides of the assembly plates (123), and two groups of mounting holes are provided on the assembly plates (123). The two groups of assembly plates (123) are screwed and fixed by two groups of fixing bolts (124).

6. A double-end mechanical seal structure according to claim 5, characterized in that: The outer sides of the upper clamp (121) and the lower clamp (122) are both provided with a slot (125), and the cross section of the slot (125) is a dovetail-shaped structure. At the same time, isolation strips (126) are installed on both sides of the inner walls of the upper clamp (121) and the lower clamp (122). The isolation strips (126) are made of rubber material and have a dovetail-shaped cross section. The upper clamp (121) and the lower clamp (122) are respectively clamped in the sealing track provided on the outer sides of the front static ring (3) and the shaft sleeve (9) through the isolation strips (126) on both sides of the inner sides thereof, and the isolation strips (126) are interference fit with the sealing track.

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